“Senior Year” is a continuing series of episodes representing a hypothetical third season of “Popular.” Most of the second-season storylines were wrapped up in the mini-series “Summer School,” so if you’re intending to read these episodes, it’s a good idea to have gone through those first.
Each link leads to a title page which contains a TV magazine listing for the episode. (Please note that the synopsis in the listing is not meant to be much more helpful than an ordinary TV Guide listing; mostly this is because the synopsis is written first, and often the episode itself turns out slightly different from what I originally envisioned.) You can read the episodes here or at FanFiction.Net. (FF.Net provides a simpler method of providing your opinion, if you wish to do so; but because of changes in their allowed list of HTML tags, the episodes there are no longer formatted very well.)
(Note that this title list may still be in flux. I don't intend it to be, but I didn't originally foresee moving “California Dreamin’” ahead to create a post-9/11 episode, either.)